Grumble. I found out that while I can ping from one VM to another I can't ssh. I also need to use arbitrary ports above 1024.
On Sat, 19 Jun 2010 01:40:32 -0600 Mike Lovell <m...@dev-zero.net> wrote: > are you using a gui or wrapper around libvirt to manage your VMs or > are you using the libvirt tools directly? Wrapper, probably virt-manager 0.7.0-3ubuntu1. > can you see the XML domain > definitions for the VMs? I see /etc/libvirt/qemu/<hostname>.xml and they sure look like configuration files. > if so, how is the networking configured for > the VMs and on the host? This looks like the relevant stanza: <interface type='bridge'> <mac address='54:52:00:74:d1:76'/> <source bridge='virbr0'/> </interface> > what is the full command line that was used > to invoke the qemu process? `cat /proc/<pid of vm qemu > process>/cmdline` to get that. Hmm, it looks like it's KVM, rather than qemu. r...@dzur:~# cat /proc/7350/cmdline /usr/bin/kvm-S-Mpc-0.11-m512-smp1-namecopper-uuidcfc4cc11-6518-28d6-0ac8-b2bb1cc2836d-monitorunix:/var/run/libvirt/qemu/copper.monitor,server,nowait-bootd-drivefile=/var/lib/libvirt/images/copper.img,if=ide,index=0-drivefile=/var/lib/libvirt/images/SLES-11-SP1-DVD-i586-GM-DVD1.iso,if=ide,media=cdrom,index=2-netnic,macaddr=54:52:00:5c:d1:f5,vlan=0,name=nic.0-nettap,fd=18,vlan=0,name=tap.0-serialpty-parallelnone-usb-vnc127.0.0.1:0-ken-us-vgacirrus-soundhwes1370r...@dzur:~# > > as i understand it, the difference between a 'NAT' configuration and > a 'host-only' configuration is that the necessary stuff for the host > to perform NAT is done during the network configuration where > host-only doesn't. so in host-only, there are no routes configured > for the vms to reach outside networks automatically. Ah. So NAT is the way to go most of the time. Thanks. > > from your description, it almost sounds like you are configuring > multiple networks. one for each vm and then doing routing on the host > between the vms. if this is how it is done, is ip forwarding enabled > on the host? `cat /proc/sys/net/ipv4/ip_forward` to check. it sounds > like it might not be since you are having trouble getting to the > outside world from your vms. my next guess would be that there are > rules in the iptables firewall that are preventing FORWARD traffic > from getting between the hosts. r...@dzur:~# cat /proc/sys/net/ipv4/ip_forward 0 r...@dzur:~# Bingo. However, writing a one to it made no difference. > > these links may also help you in your quest. > > http://libvirt.org/formatnetwork.html > http://wiki.qemu.org/Documentation/Networking > > hope that helps Thanks. I'm slowly getting further with this. > > mike > > /* > PLUG: http://plug.org, #utah on irc.freenode.net > Unsubscribe: http://plug.org/mailman/options/plug > Don't fear the penguin. > */ -- Charles Curley /"\ ASCII Ribbon Campaign Looking for fine software \ / Respect for open standards and/or writing? X No HTML/RTF in email http://www.charlescurley.com / \ No M$ Word docs in email Key fingerprint = CE5C 6645 A45A 64E4 94C0 809C FFF6 4C48 4ECD DFDB /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */